Vacuum-pump.



H. NEVILLE.

VACUUM PUMP. APPLICATION FILED FEB.26. 1914'.

Patented June 23, 1914 ill I INVENTOR if m 4 \Mkflh Q Q 3 mm w w fi a 1 3 w m a m 1m mm ,W E a b mam HARRY NEVILLE, OF NEV. YORK, N. Y., COMPANY, OF NEVI YORK, N. Y"

ASSIGNOR T8 NATE'IAN MANUFACTURING A CORPORATION G13 NEW YORK.

VACUUM-PUMP.

Application filed February 25, 1914.

To all ulzom z'zf may concern Be it known that I, I'TARRY ltnvILLn, a T citizen of the United States, residing at hew York, in the county and State of New York,

have invented certain new and useful Improvements in Vacuum-Pumps, of which the following is a specification.

This invention relates to pumps adapted to exhaust air from receptacles and is particularly constructed for use in connection with the safety apparatus for steam boilers shown in Patent #1,015,703 issued to myself on January 23, 1912, and its exact construction and mode of operation is more specifically set forth hereinafter.

To insure the proper working of the device shown in Patent #1,015,703, it is absolutely essential that air be exhausted from the mercury holding cup. Any air or gases confined in the upper interior part of this.

cup expand to a. greater degree than the mercury and push the operating piston in an upward direction sooner than intended and thereby operate the alarm prematurely.

To create a vacuum in the mercury cup in a simple and efiicient manner is the purpose of my invention, the construction and application of which is explained by reference to the accompanying drawings in which:

Figure 1 shows a sectional View of the mercury holding cup of the safety apparatus with my pump mounted thereon, and Fig. is a horizontal cross section of a part of the pump taken along the plane of line 22 in 1. Fig. 3 shows a sectional view of a modification of a part of the pump.

Like characters of reference refer to similar parts throughout the several views and the following specification:

1 is a mercury holding cup, mainly cylindrical in shape. Its upper portion is threaded internally at 2, to receive a cap 3, which provided with a central bore 1. An anuular flange 5 makes a tight joint between cap 3 and mercury cup 1. The upper end of cap 3 is threaded externally and the upper end of bore 4 increased to a larger diameter as shown at 6. An operating piston 7 is adapted to be slidably mounted within bore a of cap 3.

All the parts so far specified are more fully described and their respective functions explained in detail in Patent #1,015,703 above referred to.

Specification of Letters Iateut.

Patented June 23, 1914.

Serial No. 820,913.

I shall now proceed with the description of a preferred construction of my air exhausting pump. A socket Sis threaded in ternally at its base at 9 to engage with the upper portion 6 of cap 3. Its exterior is preferably of polygonal cross section, as shown in Fig. 2 to provide gripping surface for a wrench to facilitate screwing onto the mercury cup. An extension 10 of socket 8 is threaded externally to receive a packing nut 11, adapted to compress suitable packing material 12. A bore 13 extends longitudinally through socket 8, its diameter being somewhat larger than that of the operating piston 7 for reasons set forth hereinafter.

14: is an opening affording means of communication between bore 13 and a barrel 15 which is preferably screwed into socket 8 at 16, but may also be made part of and integral ith socket 8.

17 is a plunger head which may be seand 20 and lock nut 21 or any other convenient means.

2 is a closurefor barrel 15 provided with an opening 23 larger in diameter than the plunger rod 18.

Fig. 3 shows a modified construction of socket 8 in which the externally threaded extension 10 has been omitted and the diameter of the bore 13 above the port 14: reduced as shown at 25, so as to frictionally engage the operating piston 7.

he operation of the device is as follows: The pump is screwed onto the mercury cup 1 as shown in Fig. 1. The piston 7 is inserted into bore 13 in approximately the position shown. The packing 12 is then tightened by means of nut 11 just enough to allow the operating piston 7 to slide and at the same time resist the atmospheric pres sure. N ow the plunger 17 is pulled out. lVhen same is out about half way the operating piston 7 is pushed down quickly into bore 4, at the same time the outward stroke of the plunger 17 is being completed. It can readily be seen that the outward stroke of the plunger 17 will exhaust any air which is confined in the space 24 on top of the mercury in the cup and any air in the space between the outside diameter of plston l 7 and the diameter of bore 13 in socket 8. l The piston 7 being pushed down during the cured to an operatingrod 18 by washers 19' period of exhausting the air Wlll enter a vacuum in the mercury cup and being in frictional contact with cap 3 will effectually prevent an air from entering the mercury cup after the pump has been removed.

Various changes in the form, proportion and minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of the invention as defined in the appended claims.

hat I claim as new is:

1. In combination with an expansive element container and an operating piston of the character described, a socket adapted to be fastened onto said container, a bore through said socket, air excluding means on top of said bore and a port connecting said bore with means for exhausting air from the upper interior portion of said container while inserting said operating piston into said container.

2. In combination with an expansive ele ment container and an operating piston of the character described, a socket adapted to be fastened onto said cup, a bore extending through said socket, air excluding means on top of said bore, a port connecting said bore with the barrel of a pump, adapted to exhaust air from the upper interior portion of said container while inserting said operating piston. into said container.

3. In a socket, a bore extending through same, air excluding means on top of said bore in combination with an operating piston of the character described, air exhausting means connected to said bore, and means for fastening said socket onto a receptacle.

4,. In a socket member for aracuum pump, a bore extending through same, air excluding means on top of said bore in combination with an operating piston of the character described, a port connecting said bore with the barrel of the pump and means for fasteniinr said socket onto a receptacle.

5. In combination with a Vacuum pump, a socket adapted to be fastened onto a receptacle, a bore through said socket, suitable packing means on top of said bore, and a port connecting said bore with the pump.

6. In combination, a plunger, a pump barrel, a socket adapted to be fastened onto a receptacle, a bore extending through said socket, means for compressing packing on top of said bore, and a port connecting said bore with the barrel of the pump.

7. In combination with a pump of the character described, a socket adapted on one end to be fastened to a receptacle, the other end of said socket threaded externally, packing means engaging said externally threaded end of said socket, a bore connecting said two ends of said socket, and a port connecting said bore with the pump.

8. In combination with a pump of the character described, a socket adapted on one end to be fastened to a receptacle, a bore extending through said socket, a port con necting said bore to the pump, said bore having a reduced cylindrical portion above said port.

9. A vacuum pump comprising a plunger, a plunger rod, a pump barrel a socket, a bore extending through said socket, means for compressing packing on top of said bore, means for fastening said socket to a receptacle at the bottom of said bore, and a port connecting said bore to said pump barrel.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

HARRY NEVILLE.

Witnesses: V

IVALTER E. WOLLHEIM, ALBERT W. Morse.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

